1/* bits/time64.h -- underlying types for __time64_t. Generic version.
2 Copyright (C) 2018-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _BITS_TYPES_H
20# error "Never include <bits/time64.h> directly; use <sys/types.h> instead."
21#endif
22
23#ifndef _BITS_TIME64_H
24#define _BITS_TIME64_H 1
25
26/* Define __TIME64_T_TYPE so that it is always a 64-bit type. */
27
28#if __TIMESIZE == 64
29/* If we already have 64-bit time type then use it. */
30# define __TIME64_T_TYPE __TIME_T_TYPE
31#else
32/* Define a 64-bit time type alongsize the 32-bit one. */
33# define __TIME64_T_TYPE __SQUAD_TYPE
34#endif
35
36#endif /* bits/time64.h */
37

source code of glibc/bits/time64.h